TABLE 1.

Antimicrobial MIC ranges for S. aureus ATCC 29213 at 24 and 48 h of incubation

Antimicrobial agent and incubation time (h)No. of occurrences at a MIC (μg/ml) ofa:% Of occurrences in rangeb
0.0020.0040.0080.0160.030.060.120.250.512481632641282565121,024
Gentamicin
    24000 5 175 55 50097.9
    48000 3 147 82 80096.7
Chloramphenicol
    24003 35 180 22 098.8
    48003 23 98 114 2 98.8
Naladixic acid
    24000000183156NRc
    48000000130209NR
Ciprofloxacin
    240000000 1 220 19 00100
    480000000 0 157 81 0099.2
Levofloxacin
    240001 32 200 7 0000099.6
    480000 9 175 56 00000100
Doxycycline
    2407 51 59 83 18 20000096.3
    48003 17 102 91 27 0000098.8
Tetracycline
    2406 25 75 94 38 20000096.7
    48002 19 104 84 31 0000099.2
Streptomycin
    2400000 7 157 68 8 00096.7
    48000000 85 125 26 4 0098.3
Trimethoprim-sulfamethoxazole
    24 240 000000000100
    48 239 10000000099.6
  • a The absence of a value represents the limit of the MIC dilutions tested. Recommended QC ranges are represented in boldface characters.

  • b Percentages of results which fall within the recommended range (acceptable limit ≥95%).

  • c NR, no range recommended.